You can get... I think it's seven pounds... at a time through places like CK Products. If you are a licensed business it's almost have the price, too.

www.ckproducts.com is the licensed business side, if you're not, then check out www.countrykitchensa.com

Hope this helps a little bit. It's not Sweetex brand as far as I know, but I have been using this brand for years and have had perfect results.

Edited to add: Sorry, it's three pounds, I just checked. But that would be a nice small amount to try out. Though, it does last a long time! I get the 50# cubes and they really hold up well as long as they aren't stored where it's hot!